linux-kernel - Re: [PATCH v2] Kbuild: fix issues with rustc-option

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Message-ID: <CANiq72=1SfOrpO4VnUK90-Or8POJdPotYbN322DihgU=BHgXhQ@mail.gmail.com>
Date: Tue, 8 Oct 2024 22:21:41 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, Miguel Ojeda <ojeda@...nel.org>, 
	Matthew Maurer <mmaurer@...gle.com>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2] Kbuild: fix issues with rustc-option

On Tue, Oct 8, 2024 at 7:32 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> diff --git a/rust/probe.rs b/rust/probe.rs
> new file mode 100644
> index 000000000000..bf024e394408
> --- /dev/null
> +++ b/rust/probe.rs
> @@ -0,0 +1,7 @@
> +//! Nearly empty file passed to rustc-option by Make.
> +//!
> +//! The no_core attribute is needed because rustc-option otherwise fails due to
> +//! not being able to find the core part of the standard library.
> +
> +#![feature(no_core)]
> +#![no_core]

What I did in the GitHub issue was:

    echo '#![feature(no_core)]#![no_core]' | rustc ... -

to avoid a file just for this and so that things were closer (i.e. the
comment would be then in the `Makefile`).

Not sure what Masahiro prefers.

Cheers,
Miguel